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Free online tool
Get clear, instant password guidance without sending the password anywhere.
Local-only check
Spaces and Unicode characters are accepted. Maximum 1,024 characters.
Enter a password to check its strength.
This estimate is guidance, not a guarantee. It cannot detect password reuse, every breached password, phishing, or malware.
Privacy: Your password is checked locally and is never stored or sent.
A password strength checker analyzes a password and rates its resistance to automated guessing attacks. Unlike a password generator that creates credentials from scratch, a strength checker evaluates passwords you already use or plan to use and provides targeted, actionable feedback. This tool runs entirely in your browser — your password is never transmitted, stored, or logged anywhere. It inspects length, character variety, and common vulnerability patterns such as dictionary words, keyboard walks, repeated characters, and sequential runs.
The checker estimates strength from multiple independent signals. It measures raw length and character-class diversity (uppercase, lowercase, digits, symbols), then cross-references the input against a built-in dictionary of the most commonly breached passwords. It also detects predictable patterns including repeated characters ('aaa'), sequential runs ('abc', '123'), and keyboard walks ('qwerty', 'asdf'). Each detected weakness lowers the overall score, while length and diversity raise it. The result is a composite rating from Very Weak to Very Strong with a color-coded progress bar and a targeted checklist of improvements.
You want to check whether your existing email password 'Summer2024!' is strong enough to keep using.
You now know your original password was vulnerable and have a concrete, stronger replacement ready to save in your password manager.
No. Evaluation happens locally in your browser. The checker does not send, store, log, or save your password or its result.
Use at least 12 characters, and prefer 16 or more. A long passphrase made from unrelated words can be both strong and easier to remember.
No. Every account should have a unique password so that one breach does not expose your other accounts.
A reputable password manager can create and store long, unique passwords. Multi-factor authentication adds another useful layer of protection.
Not necessarily. A high strength score means the password resists common attack patterns, but no password is absolutely unbreakable. Combine strength with uniqueness and multi-factor authentication for best security.
Knowing your password's strength before committing it to an account is a critical security habit. This free Password Strength Checker evaluates your credentials in real time, entirely in your browser, and gives you targeted advice to close any gaps. Pair it with our Password Generator for maximum protection, and always use a unique password for every account.